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Method for chemical conversion treatment of the surface of aluminum material and aluminum material

A technology of chemical conversion treatment and aluminum material, which is applied in the direction of metal material coating process, etc., can solve environmental problems, poor corrosion resistance and other problems

Inactive Publication Date: 2009-01-28
MITSUI MINING & SMELTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the surface of the aluminum material is chemically converted by the chromate method of hexavalent chromium or the phosphoric acid-chromate method, although excellent corrosion resistance and excellent adhesion of the coating film are obtained, due to the use of hexavalent chromium Chromate, creating environmental concerns
When the surface of an aluminum material is chemically converted by the zinc phosphate method or the tannic acid method that is not a chromate method, although there is no environmental problem and the adhesion of the coating film is excellent, the corrosion resistance may be inferior to that of the chromate method. question

Method used

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  • Method for chemical conversion treatment of the surface of aluminum material and aluminum material
  • Method for chemical conversion treatment of the surface of aluminum material and aluminum material
  • Method for chemical conversion treatment of the surface of aluminum material and aluminum material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～2 and comparative example 1～7

[0048] A large number of test pieces obtained by die casting using the ADC-12 alloy were immersed in an aqueous solution of Actan 70 (manufactured by Mentex Corporation) with a concentration of 5 g / L at a liquid temperature of 40° C. for 1 minute, and then washed with tap water at room temperature for 30 seconds. Next, washing with pure water at room temperature was performed for 30 seconds.

[0049] In each of the Examples and Comparative Examples, two test specimens subjected to the above-mentioned pretreatment were used, and the amounts shown in Table 1 contained chromium nitrate-9 hydrate, 40% by mass of chromium (III) sulfate, and 99% by mass of vanadic acid. Ammonium, 98% by mass potassium fluorotitanate, 99% by mass lithium fluoride, 62% by volume nitric acid, and 95% by volume sulfuric acid were immersed in a 45°C treatment solution for 3 minutes, then washed with tap water at room temperature for 30 seconds, and then washed for 30 seconds. Seconds wash with pure water...

Embodiment 3～25 and comparative example 8～19

[0055] A large number of test pieces obtained by die casting using the ADC-12 alloy were immersed in an aqueous solution of Actan 70 (manufactured by Mentex Corporation) at a liquid temperature of 40° C. and a concentration of 5 g / L for 1 minute, and then washed with tap water at room temperature for 30 seconds. Next, washing with pure water at room temperature was performed for 30 seconds.

[0056] In each of Examples 3-25 and Comparative Examples 8-19, 2 or 3 test pieces through the above-mentioned pretreatment were used, respectively with Cr(NO 3 ) 3 , NH 4 VO 3 、K 2 TiF 6 , LiF and HNO 3 The concentration shown in Table 2 and Table 3 was immersed in a 45°C treatment solution containing chromium nitrate, ammonium vanadate, potassium fluotitanate, lithium fluoride and nitric acid for 3 minutes, and then washed with tap water at room temperature for 30 seconds. Next, washing with pure water at room temperature was performed for 30 seconds. Finally, drying was carried o...

Embodiment 26～27

[0065] A large number of test pieces obtained by die casting using the ADC-12 alloy were immersed in an aqueous solution of Actan 70 (manufactured by Mentex Corporation) at a liquid temperature of 40° C. and a concentration of 5 g / L for 1 minute, and then washed with tap water at room temperature for 30 seconds. Next, washing with pure water at room temperature was performed for 30 seconds.

[0066] Using 95% by volume of sulfuric acid as sulfuric acid, 99.5% by mass of boric acid as boric acid, and 99% by mass of nickel acetate tetrahydrate as nickel acetate, the concentration of sulfuric acid was 2 mol / L, and the concentration of boric acid was 0.2 mol / L. In the treatment liquid, the current density is 2A / dm 2, Anodizing treatment was performed at a bath temperature of 25° C. for 20 minutes, followed by immersion in a treatment solution having a nickel acetate concentration of 2 g / L at a bath temperature of 85° C. for 5 minutes to perform a sealing treatment.

[0067] In ea...

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Abstract

Disclosed is a method for chemical conversion treatment of the surface of an aluminum material comprising aluminum or an aluminum alloy. The method comprises performing a chemical conversion treatment of the surface of the aluminum material with a treatment solution for 1 to 5 minutes to form a coating film having excellent corrosion resistance and coating film adhesion property, wherein the treatment solution contains a trivalent chromium, and has a chromium nitrate content of 3 to 12 g / L in terms of Cr(NO3)3, a ammonium vanadate content of 0.5 to 7 g / L in terms of NH4VO3, a potassium fluorotitanate content of 0.5 to 3 g / L in terms of K2TiF6, a lithium fluoride content of 0.5 to 3 g / L in terms of LiF, a nitric acid content of 0.5 to 1.8 mL / L in terms of HNO3, and a liquid temperature of 40 to 50 C. Also disclosed is an aluminum material having a coating film formed by the method.

Description

technical field [0001] The present invention relates to a method for chemical conversion treatment (chemical conversion treatment) of the surface of an aluminum material containing aluminum or an aluminum alloy (hereinafter, aluminum and aluminum alloy are collectively referred to as an aluminum material) and an aluminum material having a film formed by the surface chemical conversion treatment. Specifically, it relates to a chemical conversion treatment method for the surface of an aluminum material that uses a treatment solution that does not contain hexavalent chromium but contains trivalent chromium, and an aluminum material having a film formed by the surface chemical conversion treatment. material. Background technique [0002] As the chemical conversion treatment method on the surface of aluminum materials, hexavalent chromium such as alkali-chromate method, chromate method, phosphoric acid-chromate method, zinc phosphate method, non-chromate chemical conversion treat...

Claims

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Application Information

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IPC IPC(8): C23C22/34C23C22/40
CPCC23C2222/10C23C22/44
Inventor 铃木光夫小野武
Owner MITSUI MINING & SMELTING CO LTD
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